Abstract: A multipurpose air conditioning apparatus is disclosed. The apparatus comprises fan assemblies (3, 13), a compressor (4), a condenser, an evaporator, a liquid and gas circuit, throttling means, air inlets, air outlets and means for redirecting the air flows. The apparatus is adapted such that the functions as condenser and evaporator are interchangeable for heating of air or cooling of air, respectively, in that the liquid flow in the liquid and gas circuit through the condenser, evaporator and the throttling means is reversible on demand. The apparatus comprises at least two separated units, Main and Annex, each having an air heat exchanger (2, 12), which operates as a combined condenser/evaporator, a fan assembly (3, 13), a fresh air inlet (7a, 17a), a room air inlet (7c, 17c) and a mixing chamber (x, 1x) upstream of the air heating exchangers (2, 12), an air outlet (7b, 17b) downstream of the air heating exchangers (2, 12) and means (9, 10, 19, 20) for redirecting the air flows.